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arXiv 2107.13019astro-ph.HE
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黑洞候选X射线双星MAXI J1535-571中瞬时喷流喷出物的宽带射电观测

A broadband radio view of transient jet ejecta in the black hole candidate X-ray binary MAXI J1535-571

J. Chauhan, J. C. A. Miller-Jones, G. E. Anderson, A. Paduano, M. Sokolowski, C. Flynn, P. J. Hancock, N. Hurley-Walker, D. L. Kaplan, T. D. Russell, A. Bahrami… 展开作者

J. Chauhan, J. C. A. Miller-Jones, G. E. Anderson, A. Paduano, M. Sokolowski, C. Flynn, P. J. Hancock, N. Hurley-Walker, D. L. Kaplan, T. D. Russell, A. Bahramian, S. W. Duchesne, D. Altamirano, S. Croft, H. A. Krimm, G. R. Sivakoff, R. Soria, C. M. Trott, R. B. Wayth, V. Gupta, M. Johnston-Hollitt, S. J. Tingay

摘要:

我们对黑洞候选者X射线双星MAXI J1535-571喷出的瞬态喷流进行了宽带无线电研究,该双星于2017年9月2日开始经历了长时间的爆发。我们使用Murchison宽场阵列(MWA)在2017年9月20日至10月14日的六个时期内以119至186 MHz的频率监测了MAXI J1535-571。UTMOST(升级后的莫隆格洛天文台综合望远镜)、澳大利亚平方公里阵列探路者、澳大利亚望远镜紧凑阵列(ATCA)和澳大利亚长基线阵列(LBA)在0.84-19 GHz的频率范围内准同时观测到该源。使用2017年9月23日的LBA观测,我们测量的源大小为$34\pm1$ mas。在2017年9月21日最明亮的射电耀斑期间,MWA检测到的源频率低至119 MHz,无线电频谱显示在250和500 MHz之间的转换,这很可能是由于同步加速器自吸收(SSA)。通过用SSA模型拟合无线电频谱并使用LBA尺寸测量,我们确定了喷流结的各种物理参数(在ATCA数据中识别),包括喷流张开角(= $4.5\pm1.2^{\circ}$)和磁场强度(= $104^{+80}_{-78}$ mG)。我们拟合的磁场强度与从标准均分方法推断的相当吻合,表明喷流结接近均分。我们的研究强调了澳大利亚射电望远镜套件的能力,通过在宽频率范围内同时观测,并以不同的角分辨率联合探测黑洞X射线双星(BH-XRB)中的无线电喷流。该套件使我们能够确定XRB射流的物理特性。最后,我们的研究强调了平方公里阵列(SKA-Low)的低频部分在BH-XRB研究中的潜在贡献。

英文摘要:

We present a broadband radio study of the transient jets ejected from the black hole candidate X-ray binary MAXI J1535-571, which underwent a prolonged outburst beginning on 2 September 2017. We monitored MAXI J1535-571 with the Murchison Widefield Array (MWA) at frequencies from 119 to 186 MHz over six epochs from 20 September to 14 October 2017. The source was quasi-simultaneously observed over the frequency range 0.84-19 GHz by UTMOST (the upgraded Molonglo Observatory Synthesis Telescope), the Australian Square Kilometre Array Pathfinder, the Australia Telescope Compact Array (ATCA), and the Australian Long Baseline Array (LBA). Using the LBA observations from 23 September 2017, we measured the source size to be $34\pm1$ mas. During the brightest radio flare on 21 September 2017, the source was detected down to 119 MHz by the MWA, and the radio spectrum indicates a turnover between 250 and 500 MHz, which is most likely due to synchrotron self-absorption (SSA). By fitting the radio spectrum with a SSA model and using the LBA size measurement, we determined various physical parameters of the jet knot (identified in ATCA data), including the jet opening angle (= $4.5\pm1.2^{\circ}$) and the magnetic field strength (= $104^{+80}_{-78}$ mG). Our fitted magnetic field strength agrees reasonably well with that inferred from the standard equipartition approach, suggesting the jet knot to be close to equipartition. Our study highlights the capabilities of the Australian suite of radio telescopes to jointly probe radio jets in black hole X-ray binaries (BH-XRBs) via simultaneous observations over a broad frequency range, and with differing angular resolutions. This suite allows us to determine the physical properties of XRB jets. Finally, our study emphasizes the potential contributions that can be made by the low-frequency part of the Square Kilometre Array (SKA-Low) in the study of BH-XRBs.

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